Author: admin
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ISBN Validator: ISBN-10 vs ISBN-13 Checksums, Decoded
Confirms ISBN-10 and ISBN-13 checksums.
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IBAN Validator: Is That Bank Number Even Real
Check IBAN syntax and checksums per country.
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Luhn Mock Cards: Test Checkout With Numbers That Pass the Check
Valid test cards for sandbox checkouts.
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JWT Decoder: See What an Auth Token Is Really Claiming
Split tokens into header, payload, and signature.
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UUID Checker: Version, Variant, and Well-Formedness in One Look
Confirm an identifier fits standard UUID syntax.
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Bcrypt Hash: Test Password Hashing Without a Server
Hash strings for password handling tests.
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MAC Vendor Lookup: Who Made That Device on Your Network
Identify manufacturers from MAC prefixes.
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Port Scanner Reference: What 22, 443, and 3389 Actually Are
Interactive directory of common TCP/UDP ports.
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IPv4 Subnet Calculator: Masks, Hosts, and Ranges Without the Binary
Network masks, wildcards, and host ranges.
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Piano Note to Frequency: A4 at 440 and the Math In Between
Note to Hz.